CN204424920U - Based on mixed DC system topology and the real-time simulation device thereof of LCC and MMC parallel connection - Google Patents
Based on mixed DC system topology and the real-time simulation device thereof of LCC and MMC parallel connection Download PDFInfo
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- CN204424920U CN204424920U CN201520011133.9U CN201520011133U CN204424920U CN 204424920 U CN204424920 U CN 204424920U CN 201520011133 U CN201520011133 U CN 201520011133U CN 204424920 U CN204424920 U CN 204424920U
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- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The utility model relates to mixed DC system topology based on LCC and MMC parallel connection and real-time simulation device thereof.Based on a mixed DC system topology for LCC and MMC parallel connection, include AC system, alternating current filter, LCC circuit and MMC circuit; Described alternating current filter is parallel to ac bus, and described LCC circuit and MMC circuit are connected to described AC system.Adopt the protection of the mixed DC Systematical control based on LCC and the MMC parallel connection closed loop real-time simulation device of this topological structure, be provided with real-time simulator, GTFPGA board, MMC valve control device, MMC converter level and current conversion station level control protective unit, I/O interface, LCC control protective unit and LCC-MCC hybrid system cooperative control device.The utility model can solve the different simulation step length coordination problem of LCC with MMC, and the emulator set up also can be used for the mixed DC Control protection research of LCC and MMC parallel connection and the closed loop test of control protection device, simple to operate, convenient and practical.
Description
Technical field
The utility model relates to HVDC Transmission Technology, in particular to one based on line commutation converter (Line-Communicated Converter, and the in parallel mixed DC system topology of modularization multi-level converter (Modular Multilevel Converter, MMC) and real-time simulation device thereof LCC).
Background technology
At present, what be used widely in DC transmission engineering is high voltage dc transmission technology (LCC-HVDC) based on line commutation converter, and its essential core part is the converter be made up of thyristor.LCC-HVDC is specially adapted to Large Copacity high voltage and transmits electricity at a distance occasion, there is not stationary problem, can be used for the interconnected of two unsynchronized networks.But because thyristor is half control device, can only control that it is open-minded, turn off and then need by extraneous ac grid voltage, require higher to the capacity of short circuit of receiving end AC system, and there is the problem of commutation failure.In addition, LCC-HVDC also major harmonic is large, needs a large amount of filters and reactive power compensator, can not be used for the shortcomings such as island with power.
In recent years, along with the development of power electronic device, the Technology of HVDC based Voltage Source Converter (Voltage Source Converter, VSC-HVDC) entirely controlling the voltage source converter of device based on IGBT, IEGT etc. is developed rapidly.Wherein, most is promising is the Technology of HVDC based Voltage Source Converter (MMC-HVDC) adopting modularization multi-level converter, and it controls more flexible than LCC-HVDC, can realize meritorious and idle independence and control, and do not need filter, be specially adapted to new forms of energy access electrical network.But be subject to the restriction of the full control device capacitance such as IGBT, the transmission line capability of relative LCC-HVDC, MMC-HVDC is smaller, affect its application to a certain extent.
LCC and MMC type HVDC Transmission Technology respectively have pluses and minuses; but temporarily also there is not corresponding real-time simulation pilot system for this novel mixed DC system at present; for testing corresponding control protective unit; particularly MMC type flexible direct current system needs a few microsecond simulation step length for emulating high switching frequency; and the simulation step length of LCC type direct current system only needs tens microseconds, prior art cannot solve the mixed DC real-time simulation device of different simulation step length.
Therefore, not enough for prior art, provide a kind of mixed DC system topology based on LCC and MMC parallel connection and the mixed DC Systematical control based on LCC and MMC parallel connection to protect closed loop real-time simulation device very necessary to overcome prior art deficiency.
Utility model content
The purpose of this utility model is to avoid the deficiencies in the prior art part and provides a kind of mixed DC system topology based on LCC and MMC parallel connection and the protection of the mixed DC Systematical control based on LCC and MMC parallel connection closed loop real-time simulation device; can solve the different simulation step length coordination problem of LCC with MMC, and the emulation test system set up also can be used for the mixed DC Control protection research of LCC and MMC parallel connection and the closed loop test of control protection device.
Above-mentioned purpose of the present utility model is realized by following technological means:
A kind of mixed DC system topology based on LCC and MMC parallel connection is provided, it is characterized in that:
Include AC system, alternating current filter, LCC circuit and MMC circuit;
Described alternating current filter is parallel to ac bus, and described LCC circuit and MMC circuit are connected to described AC system;
Described LCC circuit is provided with a LCC electronic circuit and the 2nd LCC electronic circuit, one LCC electronic circuit is provided with the first three-phase three winding converter transformer, the 12 pulse conversion device and the first direct current reactor, and the 2nd LCC electronic circuit is provided with the second direct current reactor, the 22 pulse conversion device and the second three-phase three winding converter transformer;
One end of described first three-phase three winding converter transformer is connected to ac bus by exchanging main circuit breaker, the described first three-phase three winding converter transformer other end is connected with one end of described 12 pulse conversion device, the other end of described 12 pulse conversion device is connected with the first direct current reactor, one end of described 22 pulse conversion device is connected with the second direct current reactor, described first direct current reactor is directly connected by DC line with described second direct current reactor, the other end of described 22 pulse conversion device is connected with one end of the second three-phase three winding converter transformer, the other end of described second three-phase three winding converter transformer is connected with ac bus by exchanging main circuit breaker,
Described MMC circuit is provided with a MMC electronic circuit and the 2nd MMC electronic circuit, one MMC electronic circuit is provided with the first three-phase double winding tietransformer, the first bypass breaker, the first starting resistance and a MMC converter, and the 2nd MMC electronic circuit is provided with the 2nd MMC converter, the second bypass breaker, the second starting resistance and the second three-phase double winding tietransformer;
One end of described first three-phase double winding tietransformer is connected in ac bus by exchanging main circuit breaker, the described first three-phase double winding tietransformer other end and first bypass breaker one end, first starting resistance one end connects, the described first bypass breaker other end, the first starting resistance other end is connected with one end of a described MMC converter, the other end of a described MMC converter is connected by DC line with one end of the 2nd MMC converter, the other end of the 2nd MMC converter and one end of the second bypass breaker, one end of second starting resistance connects, the other end of described second bypass breaker, the other end of the second starting resistance is connected with one end of described second three-phase double winding tietransformer, the other end of described second three-phase double winding tietransformer is connected with ac bus by exchanging main circuit breaker.
Preferably, an above-mentioned MMC converter is identical with the structure of the 2nd MMC converter, and each MMC converter is formed by three-phase six brachium pontis, and each brachium pontis is made up of a brachium pontis reactor and multiple submodule;
Each submodule comprises an IGBT pipe respectively, the 2nd IGBT manages, manage antiparallel first diode with an IGBT, manage antiparallel second diode with the 2nd IGBT and capacitor is formed;
The collector electrode of a described IGBT pipe is connected with the emitter of the 2nd IGBT pipe, and described capacitor one end is connected with the emitter of an IGBT pipe, and the described capacitor other end is connected with the collector electrode of the 2nd IGBT pipe.
Preferably, above-mentioned 12 pulse conversion device is identical with the structure of described 22 pulse conversion device, each 12 pulse conversion devices form by two six pulse conversion circuit connected in series, each six pulse conversion circuit are made up of three thyristor groups parallel connections, each thyristor groups is made up of two thyristors of connecting, and the tie point of two six pulse conversion circuit is connected with grounding switch.
Preferably, above-mentioned first three-phase double winding tietransformer is identical with described second three-phase double winding tietransformer structure, and three-phase double winding tietransformer is the three-phase double winding tietransformer with 50us step-length and 2.5us step-length interface.
The utility model provides a kind of mixed DC Systematical control based on LCC and MMC parallel connection to protect closed loop real-time simulation device simultaneously, is provided with real-time simulator, GTFPGA board, MMC valve control device, MMC converter level and current conversion station level control protective unit, I/O interface, LCC control protective unit and LCC-MCC hybrid system cooperative control device;
Described real-time simulator is provided with LCC artificial circuit and MMC artificial circuit, described LCC artificial circuit is provided with a LCC and emulates electronic circuit and the 2nd LCC emulation electronic circuit, and described MMC artificial circuit comprises a MMC and emulates electronic circuit and the 2nd MMC emulation electronic circuit;
One MMC emulates electronic circuit and the 2nd MMC emulation electronic circuit connects with described LCC artificial circuit respectively;
A described LCC emulates electronic circuit and is provided with the first three-phase three winding converter transformer, the 12 pulse conversion device and the first direct current reactor, and the 2nd LCC emulates electronic circuit and is provided with the second direct current reactor, the 22 pulse conversion device, the second three-phase three winding converter transformer;
One end of described first three-phase three winding converter transformer is connected to ac bus by exchanging main circuit breaker, the described first three-phase three winding converter transformer other end is connected with one end of described 12 pulse conversion device, the other end of described 12 pulse conversion device is connected with the first direct current reactor, one end of described 22 pulse conversion device is connected with the second direct current reactor, described first direct current reactor is directly connected by DC line with described second direct current reactor, the other end of described 22 pulse conversion device is connected with one end of the second three-phase three winding converter transformer, the other end of described second three-phase three winding converter transformer is connected with ac bus by exchanging main circuit breaker,
A described MMC emulates electronic circuit and is provided with the first three-phase double winding tietransformer, the first bypass breaker, the first starting resistance and a MMC converter, and the 2nd MMC emulates electronic circuit and is provided with the 2nd MMC converter, the second bypass breaker, the second starting resistance and the second three-phase double winding tietransformer;
One end of described first three-phase double winding tietransformer is connected in ac bus by exchanging main circuit breaker, the described first three-phase double winding tietransformer other end and first bypass breaker one end, first starting resistance one end connects, the described first bypass breaker other end, the first starting resistance other end is connected with one end of a described MMC converter, the other end of a described MMC converter is connected by DC line with one end of the 2nd MMC converter, the other end of the 2nd MMC converter and one end of the second bypass breaker, one end of second starting resistance connects, the other end of described second bypass breaker, the other end of the second starting resistance is connected with one end of described second three-phase double winding tietransformer, the other end of described second three-phase double winding tietransformer is connected with ac bus by exchanging main circuit breaker,
Fiberoptic connection is passed through in the alternating current circuit that one MMC emulates between electronic circuit and the 2nd MMC emulation electronic circuit, one MMC emulates electronic circuit, 2nd MMC emulates electronic circuit and connects with GTFPGA board respectively by optical fiber, GTFPGA board and MMC valve control device pass through fiberoptic connection, MMC valve control device is connected with MMC converter level and current conversion station level control protective unit by cable, MMC converter level and current conversion station level control protective unit are connected with I/O interface by cable, one MMC emulates electronic circuit, 2nd MMC emulates electronic circuit and connects with I/O interface respectively by optical fiber, LCC artificial circuit is connected with I/O interface by optical fiber, I/O interface is connected with described LCC control protective unit by cable, LCC control protective unit, MMC converter level and current conversion station level control protective unit connect with described LCC-MCC hybrid system cooperative control device respectively by cable.
Preferably, concrete PB5 board emulation LCC artificial circuit and the MMC artificial circuit adopting RTDS.
Preferably, an above-mentioned MMC converter is identical with the structure of the 2nd MMC converter, and each MMC converter is formed by three-phase six brachium pontis, and each brachium pontis is made up of a brachium pontis reactor and multiple submodule;
Each submodule comprises an IGBT pipe respectively, the 2nd IGBT manages, manage antiparallel first diode with an IGBT, manage antiparallel second diode with the 2nd IGBT and capacitor is formed;
The collector electrode of a described IGBT pipe is connected with the emitter of the 2nd IGBT pipe, and described capacitor one end is connected with the emitter of an IGBT pipe, and the described capacitor other end is connected with the collector electrode of the 2nd IGBT pipe.
Preferably, above-mentioned 12 pulse conversion device is identical with the structure of described 22 pulse conversion device, each 12 pulse conversion devices form by two six pulse conversion circuit connected in series, each six pulse conversion circuit are made up of three thyristor groups parallel connections, each thyristor groups is made up of two thyristors of connecting, and the tie point of two six pulse conversion circuit is connected with grounding switch.
Preferably, above-mentioned first three-phase double winding tietransformer is identical with described second three-phase double winding tietransformer structure, and three-phase double winding tietransformer is the three-phase double winding tietransformer with 50us step-length and 2.5us step-length interface.
The beneficial effects of the utility model are: provide a kind of mixed DC system topology based on LCC and MMC parallel connection; and protect closed loop real-time simulation device based on the mixed DC Systematical control of LCC and MMC parallel connection; the different simulation step length coordination problem of LCC with MMC can be solved; and the emulator set up also can be used for the mixed DC Control protection research of LCC and MMC parallel connection and the closed loop test of control protection device; simple to operate, convenient and practical.
Accompanying drawing explanation
Utilize accompanying drawing to be further described the utility model, but the content in accompanying drawing is not formed this any restriction of the present utility model.
Fig. 1 is the mixed DC system topology figure based on LCC and MMC parallel connection of the present utility model.
Fig. 2 is the topology diagram of MMC converter.
Fig. 3 is the topology diagram of the submodule in MMC converter.
Fig. 4 is the topology diagram of 12 pulse conversion devices.
Fig. 5 is the schematic diagram of the utility model based on the mixed DC Systematical control protection closed loop real-time simulation device of LCC and MMC parallel connection.
In Fig. 1 to Fig. 5, comprising:
AC system 10, interchange main circuit breaker 11,
Alternating current filter 20,
LCC circuit 30,
First three-phase three winding converter transformer the 311, the 12 pulse conversion device 312,
First direct current reactor 313,
Second direct current reactor the 323, the 22 pulse conversion device 322,
Second three-phase three winding converter transformer 321,
Six pulse conversion circuit 34, thyristor groups 35, thyristor 36, grounding switch 37,
MMC circuit 40,
First three-phase double winding tietransformer 411, first bypass breaker 412,
First starting resistance 413, a MMC converter 414,
2nd MMC converter 424, second bypass breaker 422, second starting resistance 423
Second three-phase double winding tietransformer 421,
Brachium pontis 45, brachium pontis reactor 46, submodule 47,
One IGBT pipe 471, the 2nd IGBT pipe 472,
First diode 473, second diode with 474, capacitor 475,
GTFPGA board 51, MMC valve control device 52,
MMC converter level and current conversion station level control protective unit 53, I/O interface 54,
LCC control protective unit 55, LCC-MCC hybrid system cooperative control device 56,
LCC artificial circuit 60, a MMC emulation electronic circuit 71,
2nd MMC emulates electronic circuit 72.
Embodiment
With the following Examples the utility model is further described.
embodiment 1.
Based on a mixed DC system topology for LCC and MMC parallel connection, as shown in Figure 1, AC system 10, alternating current filter 20, LCC circuit 30 and MMC circuit 40 is included.
Alternating current filter 20 is parallel to ac bus, and LCC circuit 30 and MMC circuit 40 are connected to AC system 10.
LCC circuit 30 is provided with a LCC electronic circuit and the 2nd LCC electronic circuit, one LCC electronic circuit is provided with the first three-phase three winding converter transformer the 311, the 12 pulse conversion device 312 and the first direct current reactor 313, and the 2nd LCC electronic circuit is provided with the second direct current reactor the 323, the 22 pulse conversion device 322 and the second three-phase three winding converter transformer 321.
One end of first three-phase three winding converter transformer 311 is connected to ac bus by exchanging main circuit breaker 11, first three-phase three winding converter transformer 311 other end is connected with one end of the 12 pulse conversion device 312, the other end of the 12 pulse conversion device 312 is connected with the first direct current reactor 313, one end of 22 pulse conversion device 322 is connected with the second direct current reactor 323, first direct current reactor 313 is directly connected by DC line with the second direct current reactor 323, the other end of the 22 pulse conversion device 322 is connected with one end of the second three-phase three winding converter transformer 321, the other end of the second three-phase three winding converter transformer 321 is connected with ac bus by exchanging main circuit breaker 11.
MMC circuit 40 is provided with a MMC electronic circuit and the 2nd MMC electronic circuit, one MMC electronic circuit is provided with the first three-phase double winding tietransformer 411, first bypass breaker 412, first starting resistance 413 and MMC converter the 414, a two MMC electronic circuit is provided with the 2nd MMC converter 424, second bypass breaker 422, second starting resistance 423 and the second three-phase double winding tietransformer 421.
One end of first three-phase double winding tietransformer 411 is connected in ac bus by exchanging main circuit breaker 11, first three-phase double winding tietransformer 411 other end and first bypass breaker 412 one end, first starting resistance 413 one end connects, first bypass breaker 412 other end, first starting resistance 413 other end is connected with one end of a MMC converter 414, the other end of the one MMC converter 414 is connected by DC line with one end of the 2nd MMC converter 424, the other end of the 2nd MMC converter 424 and one end of the second bypass breaker 422, one end of second starting resistance 423 connects, the other end of described second bypass breaker 422, the other end of the second starting resistance 423 is connected with one end of described second three-phase double winding tietransformer 421, the other end of the second three-phase double winding tietransformer 421 is connected with ac bus by exchanging main circuit breaker 11.
Concrete, a MMC converter 414 is identical with the structure of the 2nd MMC converter 424.As shown in Figure 2, each MMC converter is formed by six brachium pontis 45 of three-phase, and each brachium pontis 45 is made up of a brachium pontis reactor 46 and multiple submodule 47.
As shown in Figure 3, each submodule 47 comprises an IGBT pipe 471, the 2nd IGBT pipe 472 respectively, with antiparallel first diode 473 of an IGBT pipe 471, forms with antiparallel second diode 474 of the 2nd IGBT pipe 472 and capacitor 475.
The collector electrode of the one IGBT pipe 471 is connected with the emitter of the 2nd IGBT pipe 472, and capacitor 475 one end is connected with the emitter of an IGBT pipe 471, and capacitor 475 other end is connected with the collector electrode of the 2nd IGBT pipe 472.
12 pulse conversion device 312 is identical with the structure of the 22 pulse conversion device 322.As shown in Figure 4, each 12 pulse conversion devices are in series by two six pulse conversion circuit 34, each six pulse conversion circuit 34 are made up of the parallel connection of three thyristor groups 35, each thyristor groups 35 is made up of two thyristors 36 of connecting, and the tie point of two six pulse conversion circuit 34 is connected with grounding switch, by grounding switch 37 ground connection.
First three-phase double winding tietransformer 411 is identical with the second three-phase double winding tietransformer 421 structure, and three-phase double winding tietransformer is the three-phase double winding tietransformer with 50us step-length and 2.5us step-length interface.Whole mixed DC system partitioning is large step-length emulation (50us) and little step-length emulation (2.5us) two parts by tietransformer, and wherein the first three-phase double winding tietransformer 411, first bypass breaker 412, first starting resistance 413, a MMC converter 414, the 2nd MMC converter 424, second bypass breaker 422, second starting resistance 423 and the second three-phase double winding tietransformer 421 all adopt little step-length simulation calculation.In addition other elements all adopt in large step-length simulation calculation.
The mixed DC system topology based on LCC and MMC parallel connection of the present embodiment, can utilize the advantage that LCC and MMC is respective, provides sufficient reactive power by MMC side for LCC side, avoids commutation failure fault occurs.The present embodiment can solve the different simulation step length coordination problem of LCC with MMC, has structure simple, easy to operate feature.
embodiment 2.
A kind of protection of the mixed DC Systematical control based on LCC and MMC parallel connection closed loop real-time simulation device; as shown in Figure 5, real-time simulator, GTFPGA board 51, MMC valve control device 52, MMC converter level and current conversion station level control protective unit 53, I/O interface 54, LCC control protective unit 55 and LCC-MCC hybrid system cooperative control device 56 is provided with.
Real-time simulator adopts if embodiment 1 is based on the mixed DC system topology of LCC and MMC parallel connection, by PB5 board emulation LCC artificial circuit 60 and the MMC artificial circuit of RTDS.PB5 board calculates board for high-speed simulation, is general knowledge known in this field, do not repeat them here.
Concrete, real-time simulator emulation is provided with LCC artificial circuit 60 and MMC artificial circuit, LCC artificial circuit 60 is provided with a LCC and emulates electronic circuit and the 2nd LCC emulation electronic circuit, and MMC artificial circuit comprises a MMC and emulates electronic circuit 71 and the 2nd MMC emulation electronic circuit 72.
One MMC emulates electronic circuit 71 and the 2nd MMC emulation electronic circuit 72 connects with LCC artificial circuit 60 respectively.
One LCC emulates electronic circuit and is provided with the first three-phase three winding converter transformer, the 12 pulse conversion device and the first direct current reactor, and the 2nd LCC emulates electronic circuit and is provided with the second direct current reactor, the 22 pulse conversion device, the second three-phase three winding converter transformer.
One end of first three-phase three winding converter transformer is connected to ac bus by exchanging main circuit breaker, the first three-phase three winding converter transformer other end is connected with one end of the 12 pulse conversion device, the other end of the 12 pulse conversion device is connected with the first direct current reactor, one end of 22 pulse conversion device is connected with the second direct current reactor, first direct current reactor is directly connected by DC line with the second direct current reactor, the other end of the 22 pulse conversion device is connected with one end of the second three-phase three winding converter transformer, the other end of the second three-phase three winding converter transformer is connected with ac bus by exchanging main circuit breaker.
One MMC emulates electronic circuit 71 and is provided with the first three-phase double winding tietransformer, the first bypass breaker, the first starting resistance and a MMC converter, and the 2nd MMC emulates electronic circuit 72 and is provided with the 2nd MMC converter, the second bypass breaker, the second starting resistance and the second three-phase double winding tietransformer.
One end of first three-phase double winding tietransformer is connected in ac bus by exchanging main circuit breaker, the first three-phase double winding tietransformer other end and first bypass breaker one end, first starting resistance one end connects, the first bypass breaker other end, the first starting resistance other end is connected with one end of a MMC converter, the other end of the one MMC converter is connected by DC line with one end of the 2nd MMC converter, the other end of the 2nd MMC converter and one end of the second bypass breaker, one end of second starting resistance connects, the other end of the second bypass breaker, the other end of the second starting resistance is connected with one end of the second three-phase double winding tietransformer, the other end of the second three-phase double winding tietransformer is connected with ac bus by exchanging main circuit breaker.
One MMC converter is identical with the structure of the 2nd MMC converter, and each MMC converter is formed by three-phase six brachium pontis, and each brachium pontis is made up of a brachium pontis reactor and multiple submodule.
Each submodule comprises an IGBT pipe respectively, the 2nd IGBT manages, manage antiparallel first diode with an IGBT, manage antiparallel second diode with the 2nd IGBT and capacitor is formed.
The collector electrode of the one IGBT pipe is connected with the emitter of the 2nd IGBT pipe, and capacitor one end is connected with the emitter of an IGBT pipe, and the capacitor other end is connected with the collector electrode of the 2nd IGBT pipe.
12 pulse conversion device is identical with the structure of described 22 pulse conversion device, each 12 pulse conversion devices form by two six pulse conversion circuit connected in series, each six pulse conversion circuit are made up of three thyristor groups parallel connections, each thyristor groups is made up of two thyristors of connecting, and the tie point of two six pulse conversion circuit is connected with grounding switch.
First three-phase double winding tietransformer is identical with the second three-phase double winding tietransformer structure, and three-phase double winding tietransformer is the three-phase double winding tietransformer with 50us step-length and 2.5us step-length interface.
Fiberoptic connection is passed through in the alternating current circuit that one MMC emulates between electronic circuit 71 and the 2nd MMC emulation electronic circuit 72, one MMC emulates electronic circuit 71, 2nd MMC emulates electronic circuit 72 and connects with GTFPGA board 51 respectively by optical fiber, GTFPGA board 51 and MMC valve control device 52 pass through fiberoptic connection, MMC valve control device 52 is connected with MMC converter level and current conversion station level control protective unit 53 by cable, MMC converter level and current conversion station level control protective unit 53 are connected with I/O interface 54 by cable, one MMC emulates electronic circuit 71, 2nd MMC emulates electronic circuit 72 and connects with I/O interface 54 respectively by optical fiber, LCC artificial circuit 60 is connected with I/O interface 54 by optical fiber, I/O interface is connected with described LCC control protective unit 55 by cable, LCC control protective unit 55, MMC converter level and current conversion station level control protective unit 53 connect with LCC-MCC hybrid system cooperative control device 56 respectively by cable.
RTDS simulator should be adopted to set up LCC artificial circuit 60 and MMC artificial circuit according to the mixed DC system topology based on LCC and MMC parallel connection of embodiment 1 based on the mixed DC Systematical control protection closed loop real-time simulation device of LCC and MMC parallel connection; at the Traditional DC transmission of electricity real-time emulation system of large step-length simulated environment Imitating based on LCC, at the flexible DC power transmission real-time emulation system of little step-length simulated environment Imitating based on artificial circuit MMC.Be connected with outside LCC control protective unit 55 by I/O interface, realize the closed loop monitoring of LCC system.LCC-MCC hybrid system cooperative control device 56 realizes the unified cooperation control of two kinds of systems.
Should based on the mixed DC Systematical control protection closed loop real-time simulation device of LCC and MMC parallel connection; the different simulation step length coordination problem of LCC with MMC can be solved; and the emulator set up also can be used for the mixed DC Control protection research of LCC and MMC parallel connection and the closed loop test of control protection device; simple to operate, convenient and practical.
Finally should be noted that; above embodiment is only in order to illustrate the technical solution of the utility model but not restriction to the utility model protection range; although be explained in detail the utility model with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify to the technical solution of the utility model or equivalent replacement, and not depart from essence and the scope of technical solutions of the utility model.
Claims (9)
1., based on a mixed DC system topology for LCC and MMC parallel connection, it is characterized in that:
Include AC system, alternating current filter, LCC circuit and MMC circuit;
Described alternating current filter is parallel to ac bus, and described LCC circuit and MMC circuit are connected to described AC system;
Described LCC circuit is provided with a LCC electronic circuit and the 2nd LCC electronic circuit, one LCC electronic circuit is provided with the first three-phase three winding converter transformer, the 12 pulse conversion device and the first direct current reactor, and the 2nd LCC electronic circuit is provided with the second direct current reactor, the 22 pulse conversion device and the second three-phase three winding converter transformer;
One end of described first three-phase three winding converter transformer is connected to ac bus by exchanging main circuit breaker, the described first three-phase three winding converter transformer other end is connected with one end of described 12 pulse conversion device, the other end of described 12 pulse conversion device is connected with the first direct current reactor, one end of described 22 pulse conversion device is connected with the second direct current reactor, described first direct current reactor is directly connected by DC line with described second direct current reactor, the other end of described 22 pulse conversion device is connected with one end of the second three-phase three winding converter transformer, the other end of described second three-phase three winding converter transformer is connected with ac bus by exchanging main circuit breaker,
Described MMC circuit is provided with a MMC electronic circuit and the 2nd MMC electronic circuit, one MMC electronic circuit is provided with the first three-phase double winding tietransformer, the first bypass breaker, the first starting resistance and a MMC converter, and the 2nd MMC electronic circuit is provided with the 2nd MMC converter, the second bypass breaker, the second starting resistance and the second three-phase double winding tietransformer;
One end of described first three-phase double winding tietransformer is connected in ac bus by exchanging main circuit breaker, the described first three-phase double winding tietransformer other end and first bypass breaker one end, first starting resistance one end connects, the described first bypass breaker other end, the first starting resistance other end is connected with one end of a described MMC converter, the other end of a described MMC converter is connected by DC line with one end of the 2nd MMC converter, the other end of the 2nd MMC converter and one end of the second bypass breaker, one end of second starting resistance connects, the other end of described second bypass breaker, the other end of the second starting resistance is connected with one end of described second three-phase double winding tietransformer, the other end of described second three-phase double winding tietransformer is connected with ac bus by exchanging main circuit breaker.
2. the mixed DC system topology based on LCC and MMC parallel connection according to claim 1, it is characterized in that: a described MMC converter is identical with the structure of the 2nd MMC converter, each MMC converter is formed by three-phase six brachium pontis, and each brachium pontis is made up of a brachium pontis reactor and multiple submodule;
Each submodule comprises an IGBT pipe respectively, the 2nd IGBT manages, manage antiparallel first diode with an IGBT, manage antiparallel second diode with the 2nd IGBT and capacitor is formed;
The collector electrode of a described IGBT pipe is connected with the emitter of the 2nd IGBT pipe, and described capacitor one end is connected with the emitter of an IGBT pipe, and the described capacitor other end is connected with the collector electrode of the 2nd IGBT pipe.
3. the mixed DC system topology based on LCC and MMC parallel connection according to claim 1, is characterized in that:
Described 12 pulse conversion device is identical with the structure of described 22 pulse conversion device, each 12 pulse conversion devices form by two six pulse conversion circuit connected in series, each six pulse conversion circuit are made up of three thyristor groups parallel connections, each thyristor groups is made up of two thyristors of connecting, and the tie point of two six pulse conversion circuit is connected with grounding switch.
4. the mixed DC system topology based on LCC and MMC parallel connection according to claim 1, it is characterized in that: described first three-phase double winding tietransformer is identical with described second three-phase double winding tietransformer structure, and three-phase double winding tietransformer is the three-phase double winding tietransformer with 50us step-length and 2.5us step-length interface.
5., based on the mixed DC Systematical control protection closed loop real-time simulation device of LCC and MMC parallel connection, it is characterized in that: be provided with real-time simulator, GTFPGA board, MMC valve control device, MMC converter level and current conversion station level control protective unit, I/O interface, LCC control protective unit and LCC-MCC hybrid system cooperative control device;
Described real-time simulator is provided with LCC artificial circuit and MMC artificial circuit, described LCC artificial circuit is provided with a LCC and emulates electronic circuit and the 2nd LCC emulation electronic circuit, and described MMC artificial circuit comprises a MMC and emulates electronic circuit and the 2nd MMC emulation electronic circuit;
One MMC emulates electronic circuit and the 2nd MMC emulation electronic circuit connects with described LCC artificial circuit respectively;
A described LCC emulates electronic circuit and is provided with the first three-phase three winding converter transformer, the 12 pulse conversion device and the first direct current reactor, and the 2nd LCC emulates electronic circuit and is provided with the second direct current reactor, the 22 pulse conversion device, the second three-phase three winding converter transformer;
One end of described first three-phase three winding converter transformer is connected to ac bus by exchanging main circuit breaker, the described first three-phase three winding converter transformer other end is connected with one end of described 12 pulse conversion device, the other end of described 12 pulse conversion device is connected with the first direct current reactor, one end of described 22 pulse conversion device is connected with the second direct current reactor, described first direct current reactor is directly connected by DC line with described second direct current reactor, the other end of described 22 pulse conversion device is connected with one end of the second three-phase three winding converter transformer, the other end of described second three-phase three winding converter transformer is connected with ac bus by exchanging main circuit breaker,
A described MMC emulates electronic circuit and is provided with the first three-phase double winding tietransformer, the first bypass breaker, the first starting resistance and a MMC converter, and the 2nd MMC emulates electronic circuit and is provided with the 2nd MMC converter, the second bypass breaker, the second starting resistance and the second three-phase double winding tietransformer;
One end of described first three-phase double winding tietransformer is connected in ac bus by exchanging main circuit breaker, the described first three-phase double winding tietransformer other end and first bypass breaker one end, first starting resistance one end connects, the described first bypass breaker other end, the first starting resistance other end is connected with one end of a described MMC converter, the other end of a described MMC converter is connected by DC line with one end of the 2nd MMC converter, the other end of the 2nd MMC converter and one end of the second bypass breaker, one end of second starting resistance connects, the other end of described second bypass breaker, the other end of the second starting resistance is connected with one end of described second three-phase double winding tietransformer, the other end of described second three-phase double winding tietransformer is connected with ac bus by exchanging main circuit breaker,
Fiberoptic connection is passed through in the alternating current circuit that one MMC emulates between electronic circuit and the 2nd MMC emulation electronic circuit, one MMC emulates electronic circuit, 2nd MMC emulates electronic circuit and connects with GTFPGA board respectively by optical fiber, GTFPGA board and MMC valve control device pass through fiberoptic connection, MMC valve control device is connected with MMC converter level and current conversion station level control protective unit by cable, MMC converter level and current conversion station level control protective unit are connected with I/O interface by cable, one MMC emulates electronic circuit, 2nd MMC emulates electronic circuit and connects with I/O interface respectively by optical fiber, LCC artificial circuit is connected with I/O interface by optical fiber, I/O interface is connected with described LCC control protective unit by cable, LCC control protective unit, MMC converter level and current conversion station level control protective unit connect with described LCC-MCC hybrid system cooperative control device respectively by cable.
6. the protection of the mixed DC Systematical control based on LCC and MMC parallel connection closed loop real-time simulation device according to claim 5, is characterized in that: the PB5 board emulation LCC artificial circuit and the MMC artificial circuit that adopt RTDS.
7. the protection of the mixed DC Systematical control based on LCC and MMC parallel connection closed loop real-time simulation device according to claim 5, is characterized in that:
A described MMC converter is identical with the structure of the 2nd MMC converter, and each MMC converter is formed by three-phase six brachium pontis, and each brachium pontis is made up of a brachium pontis reactor and multiple submodule;
Each submodule comprises an IGBT pipe respectively, the 2nd IGBT manages, manage antiparallel first diode with an IGBT, manage antiparallel second diode with the 2nd IGBT and capacitor is formed;
The collector electrode of a described IGBT pipe is connected with the emitter of the 2nd IGBT pipe, and described capacitor one end is connected with the emitter of an IGBT pipe, and the described capacitor other end is connected with the collector electrode of the 2nd IGBT pipe.
8. the protection of the mixed DC Systematical control based on LCC and MMC parallel connection closed loop real-time simulation device according to claim 5; it is characterized in that: described 12 pulse conversion device is identical with the structure of described 22 pulse conversion device; each 12 pulse conversion devices form by two six pulse conversion circuit connected in series; each six pulse conversion circuit are made up of three thyristor groups parallel connections; each thyristor groups is made up of two thyristors of connecting, and the tie point of two six pulse conversion circuit is connected with grounding switch.
9. the protection of the mixed DC Systematical control based on LCC and MMC parallel connection closed loop real-time simulation device according to claim 5; it is characterized in that: described first three-phase double winding tietransformer is identical with described second three-phase double winding tietransformer structure, and three-phase double winding tietransformer is the three-phase double winding tietransformer with 50us step-length and 2.5us step-length interface.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105140961A (en) * | 2015-09-11 | 2015-12-09 | 中国能源建设集团广东省电力设计研究院有限公司 | Hybrid direct-current power transmission device used for new energy grid connection and power transmission method thereof |
| CN108336751A (en) * | 2018-03-16 | 2018-07-27 | 云南电网有限责任公司 | A kind of electromechanical transient modeling method of LCC-MMC mixed DCs power grid |
| CN108663946A (en) * | 2017-03-31 | 2018-10-16 | 南方电网科学研究院有限责任公司 | The test method and system of control protective unit in a kind of multiterminal Hybrid HVDC |
| CN109659968A (en) * | 2018-12-28 | 2019-04-19 | 国网江苏省电力有限公司经济技术研究院 | A kind of electromechanical transient modeling method for dispersing access type LCC-MMC mixed DC system |
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2015
- 2015-04-11 CN CN201520011133.9U patent/CN204424920U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105140961A (en) * | 2015-09-11 | 2015-12-09 | 中国能源建设集团广东省电力设计研究院有限公司 | Hybrid direct-current power transmission device used for new energy grid connection and power transmission method thereof |
| CN108663946A (en) * | 2017-03-31 | 2018-10-16 | 南方电网科学研究院有限责任公司 | The test method and system of control protective unit in a kind of multiterminal Hybrid HVDC |
| CN108336751A (en) * | 2018-03-16 | 2018-07-27 | 云南电网有限责任公司 | A kind of electromechanical transient modeling method of LCC-MMC mixed DCs power grid |
| CN108336751B (en) * | 2018-03-16 | 2021-08-06 | 云南电网有限责任公司 | Electromechanical transient modeling method for LCC-MMC hybrid direct-current power grid |
| CN109659968A (en) * | 2018-12-28 | 2019-04-19 | 国网江苏省电力有限公司经济技术研究院 | A kind of electromechanical transient modeling method for dispersing access type LCC-MMC mixed DC system |
| CN109659968B (en) * | 2018-12-28 | 2020-06-30 | 国网江苏省电力有限公司经济技术研究院 | Electromechanical transient modeling method for distributed access type LCC-MMC (lower control limit-multilevel converter) mixed direct-current system |
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Effective date of registration: 20210608 Address after: 510700 3rd, 4th and 5th floors of building J1 and 3rd floor of building J3, No.11 Kexiang Road, Science City, Luogang District, Guangzhou City, Guangdong Province Patentee after: China Southern Power Grid Research Institute Co.,Ltd. Address before: 510080 Guangzhou, Yuexiu District, Guangdong Province Dongfeng East Road, 6 water tower, Guangdong tower. Patentee before: CSG POWER GRID TECHNOLOGY RESEARCH CENTER Patentee before: China Southern Power Grid Research Institute Co.,Ltd. |